NAME¶

std::vector::assign_range - std::vector::assign_range

Synopsis¶

template< container-compatible-range<T> R > (since C++23)
constexpr void assign_range( R&& rg );

Replaces elements in the container with a copy of each element in rg.

All iterators (including the end() iterator) and references to the elements are
invalidated.

Each iterator in the range rg is dereferenced exactly once.

The behavior is undefined if rg overlaps with the container.

Parameters¶

rg - an input_range with reference type convertible to
the element type of the container

Type requirements¶

-
std::assignable_from<T&, ranges::range_reference_t<R>> must be modeled. Otherwise,
the program is ill-formed.
-
T must be EmplaceConstructible into the container from *ranges::begin(rg). If R
models neither sized_range nor forward_range, T must be also MoveInsertable into the
container. Otherwise, the behavior is undefined.

Return value¶

(none)

Notes¶

Feature-test macro Value Std Feature
__cpp_lib_containers_ranges 202202L (C++23) Ranges-aware construction and insertion

Example¶

// Run this code

#include <algorithm>
#include <cassert>
#include <vector>
#include <list>

int main()
{
const auto source = std::list{2, 7, 1};
auto destination = std::vector{3, 1, 4};
#ifdef __cpp_lib_containers_ranges
destination.assign_range(source);
#else
destination.assign(source.cbegin(), source.cend());
#endif
assert(std::ranges::equal(source, destination));
}

See also¶

insert_range inserts a range of elements
(C++23) (public member function)
append_range adds a range of elements to the end
(C++23) (public member function)
assign assigns values to the container
(public member function)